God had been revealing about the destruction through the prophets well in advance. The reason in his ambition is that they would acquire repentance and would come into his protection. The citizens of Nineveh through the preaching of Jonah, had realized their mistakes, repented and acquired the protection of God. In this way God himself had revealed about the deeds of destruction that he was about to perform through the preaching of the people he had chosen, and if they don’t acquire repentance through the change of hearts, he had been destroying them.
In the same way God revealed to the world through John around 2000 years back, about current period that would be about to end, the second coming of Lord Christ, the incidents that would take place.
But in these end days, in the sense, when the destruction of the world is approaching, in a way that all would understand, the reasons for the Doomsday, and how it would take place about such facts, through his book, to let it known to all, choosing us, and through us, fulfilling this deed of this book, to enable each and every one to read this book and would acquire repentance, this is being a warning of God. Otherwise, God warns that the destruction is inevitable. It is the ambition of God that each and every one must know the secrets of his coming, because God is not the one who performs the deeds secretly. He would reveal it well in advance through his prophets, he would give them some time, and if they don’t acquire repentance, he would destroy them. As a part of that, he had chosen us, he had bestowed us the divine wisdom, how the method of the destruction of the world would take place, its consequences and had instigated us to write in a simple way that each and every one would easily understand and is giving a warning to the citizen of the entire world through this book.